Erm, what does this mean?
Love is in the air for the white belted ruffed lemurs at Belfast Zoo in Northern Ireland.
Albert, a blue-billed curassow, makes a beeline for some heart-shaped treats. Birds at the National Zoo in Washington D.C. were treated to Valentine's Day snacks made from water, grapes, strawberries, apples, papayas and peanut butter.
Biologist Matt Evans offers a sweet treat to an Aldabra tortoise at the National Zoo in Washington, D.C.
Cuban crocodiles at the zoo got more ghoulish treats. Their heart-shaped snacks were made with cow blood, beet juice, gelatin, white rats and black mice.
Bearing true feelings
Walker the polar bear shows his appreciation for his fish-scented valentine at the Highland Wildlife Park in Scotland.